Most of the data collected about us comes back at us in the form of "targeted advertising."

Click to expand...

It's not though. Take the latest FB brouhaha.

People would use their FB login to login to other sites. Collected
People would put in all types of personal details, current job, at least state of the country, cell #, email, etc...
People would also create circles, name them coworkers, friends, family, alumni, etc...
People would converse with others, apply any type of algorithmic research here.

Now the above AND MORE is available to FB.
Cambridge Analytica didn't just start pulling this data with Trump, it started back with Obama. FB KNEW they were siphoning data out of FB, but didn't care (Obama!!!). It only became a big deal with Trump. But the big deal is actually bigger if you understand exactly how easily CA was able to pull that data, how non-caring FB was with your personal information.

I've been howling about Internet privacy for years. And it's not just the data that you provide, either. There are many public records that are accessible, and companies will cheerfully pay to scrape that data for their records.